package com.hjr.leetcode.util.entity;

import java.util.ArrayList;

public class ListNode {
     public int val;
     public ListNode next;
     public ListNode() {}
     public ListNode(int val) { this.val = val; }
     public ListNode(int val, ListNode next) { this.val = val; this.next = next; }

//     @Override
//     public String toString() {
//         ArrayList<Integer> list = new ArrayList<>();
//          list.add(this.val);
//          while (next != null){
//               list.add(next.val);
//               next = next.next;
//          }
//          return list.toString();
//     }

     public String toStr() {
         ArrayList<Integer> list = new ArrayList<>();
          list.add(this.val);
          while (next != null){
               list.add(next.val);
               next = next.next;
          }
          return list.toString();
     }
 }
